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9 changes: 5 additions & 4 deletions doc/api/dgram.md
Original file line number Diff line number Diff line change
Expand Up @@ -78,10 +78,11 @@ added: v0.6.9
* `multicastAddress` {String}
* `multicastInterface` {String}, Optional

Tells the kernel to join a multicast group at the given `multicastAddress`
using the `IP_ADD_MEMBERSHIP` socket option. If the `multicastInterface`
argument is not specified, the operating system will try to add membership to
all valid networking interfaces.
Tells the kernel to join a multicast group at the given `multicastAddress` and
`multicastInterface` using the `IP_ADD_MEMBERSHIP` socket option. If the
`multicastInterface` argument is not specified, the operating system will choose
one interface and will add membership to it. To add membership to every
available interface, call `addMembership` multiple times, once per interface.

### socket.address()

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